Psycho LFO by Ken Stone and his description on the page : This is a bizarre little LFO that produces a wide range of pseudo random effects. It is essentially a reworked version of my 1984 "fluorescent simulator" for model railways, and came about when I was wondering what I could do with a left-over PCB from this project. The effect was so good, I've designed a PCB specifically for it. http://www.cgs.synth.net/modules/psycho_lfo.html